Omega CN4420 Series User manual

TABLE OF CONTENTS

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Model Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Outer Dimensions and Panel Cutout Size . . . . . . . . . . . . . . . . . . . . . . . 15

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Wiring Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Front Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Front Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Programming

1. Set Up Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2. System Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Appendix A: Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Appendix B: Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Appendix C: Heater Burnout Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Appendix D: Heat/Cool Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

INTRODUCTION

The OMEGA CN4420, CN4520, CN4620, and CN4720 Series controllers

are economical process controllers that accept temperature or process

inputs, and have sophisticated control capabilities, providing on/off

control, PID, or autotune PID, with Fuzzy Logic. The controllers have

common features, but differ in panel-size requirements. They are avail-

able with mechanical relay, 24 VDC SSR driver, or 4-20 mA output. They

also come with an 8-segment ramp/soak function.

The CN4420 units have single digital display for indication of process/

setpoint values. These are available with a single control output and

optional process alarm. They are used in conjunction with a socket.

The CN4520, CN4620, and CN4720 units have dual digital displays for

simultaneous indication of process value and setpoint. These units are

available with either single or dual outputs; dual output models can be

used for heat/cool, heat/heat or cool/cool control. Options available

include dual alarms (user-selectable between high/low and deviation

action), as well as an inoperative-heater alarm. The heater alarm is a

1A mechanical relay that is triggered when the heater current trans-

former senses that the heater is not getting power.

FEATURES

• Fuzzy Logic Control

• PID Autotune with manual over-

ride - heating or cooling

• Programmable control action -

reverse or direct

• Programmable cycle time

• Programmable inputs - Thermo-

couple/RTD or

DC Current/Voltage

• Sensor burn-out protection

• Zero/span calibration

• Outputs: Relay, Solid-state relay

drive, and 4-20mA DC

• Secondary output for

cooling (optional)

• High/low alarm

outputs (optional)

• Heater burnout alarm (optional)

(only on CN4520, CN4620,

CN4720)

• Menu driven format

• Setting – touch keys on front

panel

• Programmable 8-segment

ramp/soak function

• Digital filtering (to suppress

factory noise)

• Adjustable setpoint range

• Selectable °F/°C

• Offset adjustments

• Programmable decimal point

• Programmable lock feature

• Advanced security options to

prevent unauthorized para-

meter changes

• 4-digit, LED indication

• Output status indication

• Fault indication

• Non-volatile memory

• 1/16, 1/8, 1/4 DIN and 72mm

panel mount package

• NEMA 4X faceplate

• ABS plastic housing

• Termination– screw-down type

(CN4520, CN4620, CN4720) or

socket with screw-down

terminals (CN4420)

• Metal mounting bracket; plastic

bracket for CN4420

• 85 to 264V AC free voltage

power supply

• 24V AC/DC power supply

(optional)

• UL, C-UL recognized

• CE approved

SAFETY PRECAUTIONS

Before using this product, the user is requested to read the following

precautions carefully to ensure safety. The safety requirements are

classified as either “warning” or “caution” according to the following

explanations:

Warning

Wiring

1. If there is danger of serious accident resulting from a failure or

defect in this unit, provide the unit with an appropriate external

protective circuit to prevent an accident.

2. The unit is normally supplied without a power switch or a fuse. Use

power switch and fuse as required (Rating of the fuse: 250V, 1A)

Power supply

1. Be sure to use the rated power supply voltage to protect the unit

against damage and to prevent failure.

2. Keep the power off until all of the wiring is completed so that electric

shock and trouble with the unit can be prevented.

General

1. Never attempt to disassemble, modify, or repair this unit. Tampering

with the unit may result in malfunction, electric shock, or fire.

2. Do not use the unit in combustible or explosive gaseous atmos-

pheres.

Warning suggesting that the user's mishandling can

result in personal death or serious injury.

Caution

suggesting that the user's mishandling can result

in personal injury or damage to the property.

Caution

Installation

1. Avoid installing the unit in places where:

• the ambient temperature may reach beyond the range of -10 to 50°C

(14 to 122°F) while in operation

• the humidity may reach higher than 90% RH while in operation

• a change in the ambient temperature is so rapid as to cause

condensation

• corrosive gases (sulfide and ammonia gas, in particular) or

combustible gases are emitted

• the unit is subject to vibration or shock

• the unit is likely to come in contact with water, oil, chemicals, steam,

or vapor

• the unit is exposed to dust, salt, or air containing iron particles

• the unit is subject to interference with static electricity, magnetism,

or noise

• the unit is exposed to direct sunlight

• heat may be accumulated due to radiation

Maintenance

1. Do not use organic solvents such as alcohol or benzene to wipe this

unit. Use a neutral detergent.

UNPACKING

Remove the packing list and verify that you have received all equipment,

including the following (quantities in parenthesis):

• Process controller (1)

• Mounting bracket (1)

• Socket with CN4420 (1)

• Operator’s manual (1)

• Waterproof gasket (1)

• 250Ωprecision resistor (when required) (1)

• Current transformer (when required) (1)

If you have any questions about the shipment please call the OMEGA

Customer Service Department.

When you receive the shipment, inspect the container and equipment for signs

of damage. Note any evidence of rough handling in transit. Immediately report

any damage to the shipping agent.

Note:

The carrier will not honor damage claims unless all shipping materials are

saved for inspection. After examining and removing contents, save packing

material and carton in the event reshipment is necessary.

MODEL DESCRIPTION

Single Output Models

_________________________________________________________________

CN4421(*)-(**) 1/16 DIN controller

CN4521(*)-(**) 1/8 DIN controller

CN4621(*)-(**) 1/4 DIN controller

CN4721(*)-(**) 72 mm sq. controller

_________________________________________________________________

Dual Output Models

_________________________________________________________________

CN4522(*)-(**)-(***) 1/8 DIN controller

CN4622(*)-(**)-(***) 1/4 DIN controller

CN4722(*)-(**)-(***) 72 mm sq. controller

_________________________________________________________________

* Specify TR for Thermocouple/RTD input or CV for current/voltage input

** Specify first output code from Output Options table below

*** Specify second output code from Output Options table below

OUTPUT OPTIONS

_________________________________________________________________

Option Type First Output Second Output*

_________________________________________________________________

Relay -R1 -R2

DC SSR driver -D1 -D2

4-20 mA -F1 -F2

_________________________________________________________________

* Available on CN4522, 4622, and 4722 models only

ALARM OPTION FOR CN4421

_________________________________________________________________

-A Single alarm

ALARM OPTIONS FOR CN4520, 4620, AND 4720 SERIES

_________________________________________________________________

-A2 Dual alarms

-H30* Heater burnout alarm, includes 0 to 30A current transformer

-H50* Heater burnout alarm, includes 20 to 50A current transformer

_________________________________________________________________

* Not available with options F1 or F2

All alarm relays share the same common

Both process and heater burnout alarm can be selected at the same time

LOW VOLTAGE POWER SUPPLY OPTION

_________________________________________________________________

-24V 24V AC/DC, 50/60 Hz

MODEL CONFIGURATION

SPECIFICATIONS

INPUT RANGE TABLE:

_________________________________________________________

Input Signal Input Range Input Range Remarks

(°C) (°F)

_________________________________________________________

Thermocouple*

J 0 ~ 800 32 ~ 1472 Cold Junction

K 0 ~ 1200 32 ~ 2192 compensating

R 0 ~ 1600 32 ~ 2912 function built-in

B 0 ~ 1800 32 ~ 3272

S 0 ~ 1600 32 ~ 2912

T -199 ~ 200 -328 ~ 392

T -150 ~ 400 -238 ~ 752

E -199 ~ 800 -328 ~ 1472

N 0 ~ 1300 32 ~ 2372

PL2 0 ~ 1300 32 ~ 2372

_________________________________________________________

RTD*

Pt100 -150 ~ 850 -238 ~ 1562 Allowable wiring

α= .00385 resistance 10 ohms

max (per wire).

_________________________________________________________

DC Voltage/

Current**

1-5V Scaling Range: -1999 to 9999 For current input, use

0-5V Engineering the 250Ω resistor to

4-20mA units obtain 1-5V DC or

0-20mA 0-5V DC input.

_________________________________________________________

* For TR models

** For CV models

See also the description for parameter P-n2 in the programming section, on

how to program for a particular input.

CONTROL FUNCTION

(SINGLE OUTPUT)

_________________________________________________________

Control action PID control with auto-tuning

Fuzzy control with auto-tuning

_________________________________________________________

Proportional band (P) 0-999.9% of full scale (FS), setting in 0.1% steps

_________________________________________________________

Integral time (I) 0-3200 sec, setting in 1 sec steps

_________________________________________________________

Differential time (D) 0-999.9 sec, setting in 0.1 sec steps

_________________________________________________________

P,I,D = 0: On/off action

I,D = 0: Proportional action

_________________________________________________________

Proportional cycle 1-150 sec, setting in 1 sec steps, for relay contact

output and DC SSR driver output only

_________________________________________________________

Hysteresis width 0-50% FS, setting in 1 E.U.(Engineering Units) steps

On/Off action only

_________________________________________________________

Anti-reset wind up 0-100% FS, setting in 1 E.U. steps, auto-setting

with auto-tuning

_________________________________________________________

Input sampling cycle 0.5 sec

_________________________________________________________

CONTROL FUNCTION

(DUAL OUTPUT) (Heat/Cool Type) CN4522, CN4622, CN4722 only

_________________________________________________________

Heating Proportional band P x 1/2 (P= 0-999.9%)

_________________________________________________________

Cooling Proportional band Heating proportional band x Cooling proportional

band coefficient

Cooling proportional band coefficient= 0-100

0: On/Off action

_________________________________________________________

Integral time 0-3200 sec for heating and cooling

_________________________________________________________

Differential time 0-999.9 sec for heating and cooling

_________________________________________________________

P,I,D= 0: On/Off action (without dead band) for heating and cooling

I,D= 0: Proportional action

_________________________________________________________

Proportional cycle 1-150 sec, for relay contact output and DC SSR

driver output only

_________________________________________________________

Hysteresis width On/Off action for heating and cooling: 0.5% FS

On/Off action for cooling: 0.5% FS

_________________________________________________________

Anti-reset wind-up 0-100% FS, setting in 1 E.U. steps, auto-setting

with auto-tuning

_________________________________________________________

Overlap/dead band ±50% of heating proportional band

_________________________________________________________

Input sampling cycle 0.5 sec

_________________________________________________________

OUTPUT

(Single Output)

_________________________________________________________

Control output One of the following three types is selected:

(1) Relay contact (SPDT)

220V AC/30V DC, 3A (resistive load)

Mechanical life: 107times (under no load)

Electrical life: 105times (under the rated load)

(2) DC SSR driver (voltage pulse):

15-30V DC at ON/0.5V DC or less at OFF.

Current: 60mA or less.

(3) 4-20mA DC:

Allowable load resistance– 600Ωor less.

_________________________________________________________

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